<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>对计算机专业的认识</title>
<style>
.button {
  background-color: #4CAF50; /* Green */
  border: none;
  color: white;
  padding: 16px 32px;
  text-align: center;
  text-decoration: none;
  display: inline-block;
  font-size: 16px;
  margin: 4px 2px;
  transition-duration: 0.4s;
  cursor: pointer;
}

.button1 {
  background-color: white;
  color: black;
  border: 2px solid #555555;
}

.button1:hover {
  background-color: #555555;
  color: white;
}
ul {
  list-style-type: none;
  margin: 0;
  padding: 0;
  overflow: hidden;
  background-color: #333;
}

li {
  float: left;
}

li a {
  display: block;
  color: white;
  text-align: center;
  padding: 14px 16px;
  text-decoration: none;
}

li a:hover:not(.active) {
  background-color: #111;
}

.active {
  background-color: #9999ff;
}
li {
  border-right: 1px solid #bbb;
}

li:last-child {
  border-right: none;
}
ul {
  position: fixed;
  top: 0;
  width: 100%;
}
.header {
  padding: 20px;
  text-align: center;
}

/* 清除列之后的浮动 */
.row:after {
  content: "";
  display: table;
  clear: both;
}

/* 响应式布局 - 创建堆叠而非并排的三列 */
@media screen and (max-width:600px) {
  .column {
    width: 100%;
  }
}
#d1{
				width: 100px;
				height: 100px;
				border: 1px solid black;
				border-radius: 50%;
				overflow: hidden;
				margin:75px 200px 20px 800px
			}

html,body{
				width:100%;
				height:100%;
				margin:0;
				padding:0;
				overflow: hidden;

</style>
</head>
<body background="背景1.jpg";
      style="
background-repeat:no-repeat;
background-size:100%">
<ul>
  <li><a href="主页.html">主页</a></li>
  <li><a class="active" href="#">对计算机专业的认识</a></li>
  <li><a href="计算机各课程关系.html">计算机各课程关系</a></li>
  <li><a href="未来学业规划.html">未来学业规划</a></li>
  <li><a href="计算机各课程资料.html">计算机各课程资料</a></li>
</ul>
<div style="padding:20px;margin-top:30px;height:1500px;">
    <a href="对计算机专业的认识.docx" class="button button1" style="margin:350px 100px 100px 750px">点此处获取作业</a>
</body>
</html>


